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However if it delivers the required power then the efficiency is of secondary importance.

It is usually mounted inside a mill building below the working floor.

Overshot and backshot water wheels are typically used where the available height difference is more than a couple of meters.

Breastshot wheels are more suited to large flows with a moderate head.

Undershot and stream wheel use large flows at little or no head.

There is often an associated millpond, a reservoir for storing water and hence energy until it is needed.

is a vertically mounted water wheel that is rotated by the water in a water course striking paddles or blades at the bottom of the wheel.

Both kinetic (movement) and potential (height and weight) energy are utilised.Most commonly, the wheel is mounted vertically on a horizontal axle, but can also be mounted horizontally on a vertical shaft, for example the tub or Norse.Vertical wheels can transmit power either through the axle or via a ring gear and typically drive belts or gears; horizontal wheels usually directly drive their load.Some water wheels are fed by water from a mill pond, which is formed when a flowing stream is dammed.A channel for the water flowing to or from a water wheel is called a mill race.

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